I can't open Tiff files in Photoshop CC 2018, I get error message "Could not complete your request as it is not the right kind of document". I am editing the images for a friend and they don't want to convert them to jpg. Please can anyone help with a solution. Thank you.
I encounter this when I get TIFF files created by the all-in-one printer, copier, scanner and fax machine that one of my clients uses.
If you’re running macOS, try opening the TIFF in Apple Preview. If that works, you can export to a file format that Photoshop will open (you can drag and drop to the Desktop or a folder as well). If the TiFF has layers, I have found drag and drop to be the quickest way to get the them into PS.
What John and Warren said is very true and having a bogus extension can really cause problems. But, like Warren pointed out, if you can view the document in your OS, then you can usually figure out what kind of file it is. If dragging and dropping doesn't allow you to open the document, you can also try to change the file extension to see if that works.